135
WUCN11 CWTO 040724
YELLOW WARNING - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 3:24 A.M. EDT SATURDAY 4 JULY 2026.
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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:
=NEW= NIAGARA FALLS - WELLAND - SOUTHERN NIAGARA REGION
ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION.
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IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH
==DISCUSSION==
UPDATED OR ENDED BY 5:23 A.M. EDT.
AT 3:24 A.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING STRONG WIND GUSTS, LOONIE
TO PING PONG BALL SIZE HAIL AND HEAVY RAIN.
THUNDERSTORM LOCATION: OVER THOROLD
MOTION: MOVING EAST AT 40 KM/H
HAZARDS:
WIND: DAMAGING (90 - 110 KM/H)
HAIL: UP TO QUARTER SIZE (UP TO 2.5 CM)
RAIN: HEAVY (15 - 50 MM)
LOCATIONS IN THE PATH:
ST. CATHARINES
THOROLD
NIAGARA FALLS
HEAVY RAIN MAY CAUSE FLASH FLOODING AND SIGNIFICANT REDUCTIONS TO
VISIBILITY. LARGE HAIL MAY CAUSE SIGNIFICANT DAMAGE AND INJURY. TAKE
IMMEDIATE COVER IF A THUNDERSTORM APPROACHES. IF OUTSIDE, PROTECT
YOURSELF FROM FLYING DEBRIS AND HAIL. SEVERE THUNDERSTORM WARNINGS
ARE ISSUED WHEN IMMINENT OR OCCURRING THUNDERSTORMS ARE EXPECTED TO
PRODUCE DAMAGING HAIL, WIND OR RAIN.
EMERGENCY MANAGEMENT ONTARIO RECOMMENDS THAT YOU TAKE COVER
IMMEDIATELY IF THREATENING WEATHER APPROACHES.
PLEASE CONTINUE TO MONITOR ALERTS AND FORECASTS ISSUED BY
ENVIRONMENT CANADA.
TO REPORT SEVERE WEATHER IN ONTARIO, SEND AN EMAIL TO
ONSTORM(AT)EC.GC.CA OR POST REPORTS ON X USING (HASH)ONSTORM.
FOR MORE INFORMATION:
HTTPS://WWW.ONTARIO.CA/PAGE/BE-PREPARED-EMERGENCY.
HTTP://WEATHER.GC.CA
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